25492021990 has 32 divisors (see below), whose sum is σ = 47475461376. Its totient is φ = 9845038080.

The previous prime is 25492021981. The next prime is 25492021993. The reversal of 25492021990 is 9912029452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25492021993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39274 + ... + 229186.

It is an arithmetic number, because the mean of its divisors is an integer number (1483608168).

Almost surely, 2^25492021990 is an apocalyptic number.

25492021990 is a deficient number, since it is larger than the sum of its proper divisors (21983439386).

25492021990 is a wasteful number, since it uses less digits than its factorization.

25492021990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190384.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 25492021990 in words is "twenty-five billion, four hundred ninety-two million, twenty-one thousand, nine hundred ninety".